Pour about two tablespoons of olive oil in a large wide frying pan with high sides. (or a large pot, see note #2) Heat on medium high.
Brown pork first and then beef in batches, about a pound at a time leaving enough room in the pan so the meat will brown instead of steam. Season with a little pepper only (no salt). Ensure each batch gets some brown caramelization on the outside of the meat. As the meat cooks, break into peanut sized pieces and continue to scrape the bottom of your pan to loosen brown bits. Set each batch aside after it's cooked in a large bowl. Add more oil if needed in between batches.
At this point you will likely have accumulated some oil in the bottom of your pan. If not, add another tablespoon. Add your tomato paste and cook on medium heat until it turns about two shades darker. Be careful, it may splatter. Once tomato paste is a nice brick red, remove to the same bowl as the meat.
Deglaze the pan with a little broth or wine, pour all of the liquid and brown bits over the reserved meat and tomato paste.
Add about a half cup of olive oil to the pan over medium heat and then add your onion, carrot and celery. Add more olive oil, stirring as you go until vegetable mixture is well saturated, but not quite covered in oil, this will likely be about another cup of olive oil. Add thyme sprigs. Cook on medium heat, stirring every few minutes until mixture turns a caramel color.
Transfer all cooked ingredients to a large dutch oven or pot. If pan has more brown bits stuck to it, deglaze again and pour into new pot. Add the garlic, wine, stock, cream, bay leaves, orange zest, lemon zest, cinnamon, tomatoes, parmesan cheese, oregano, and nutmeg. Season with salt and pepper. Stir well and now turn heat on to medium high, bring to a boil and then immediately reduce heat to low.
Let sauce simmer stirring occasionally and scraping the bottom of the pot. Taste after about two hours, adjust seasoning as needed. See note #4. Cook for an additional 30-60 minutes or until flavors are melded and sauce has reduced. During the last hour skim off fat from the top of the sauce. See note #5.
Serve on top of your favorite pasta or egg noodle. Toss your noodles with butter and parmesan before adding sauce on top.